#include <REGX52.H>
#include "Delay.h"

//独立按键函数,获取按键键码
//返回值0-4，无按键按下时，返回值为0

unsigned char Key()
{
	unsigned char KeyNumber = 0;
	//按键1 2 3 4 
	if(P3_1==0){Delay(20);while(P3_1==0);Delay(20);KeyNumber=1;}
	if(P3_0==0){Delay(20);while(P3_0==0);Delay(20);KeyNumber=2;}
	if(P3_2==0){Delay(20);while(P3_2==0);Delay(20);KeyNumber=3;}
	if(P3_3==0){Delay(20);while(P3_3==0);Delay(20);KeyNumber=4;}
	
	return KeyNumber;
}